scholarly journals High vertical resolution analyses of gravity waves and turbulence at a midlatitude station

2012 ◽  
Vol 117 (D2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Shao Dong Zhang ◽  
Fan Yi ◽  
Chun Ming Huang ◽  
Kai Ming Huang
Keyword(s):  
Gravity Waves ◽  
Vertical Resolution ◽  
High Vertical Resolution

Transport and Mixing in the Extratropical Tropopause Region in a High-Vertical-Resolution GCM. Part II: Relative Importance of Large-Scale and Small-Scale Dynamics

2010 ◽  
Vol 67 (5) ◽  
pp. 1315-1336 ◽  
Author(s):  
Kazuyuki Miyazaki ◽  
Shingo Watanabe ◽  
Yoshio Kawatani ◽  
Kaoru Sato ◽  
Yoshihiro Tomikawa ◽  
...  
Keyword(s):  
Gravity Wave ◽  
Gravity Waves ◽  
Large Scale ◽  
Three Dimensional ◽  
Small Scale ◽  
Vertical Resolution ◽  
Tropopause Region ◽  
High Vertical Resolution ◽  
Transport And Mixing ◽  
Extratropical Tropopause

Abstract The relative roles of atmospheric motions on various scales, from mesoscale to planetary scale, in transport and mixing in the extratropical tropopause region are investigated using a high-vertical-resolution general circulation model (GCM). The GCM with a vertical resolution of about 300 m explicitly represents the propagation and breaking of gravity waves and the induced transport and mixing. A downward control calculation shows that the Eliassen–Palm (E-P) flux of the gravity waves diverges and induces a mean equatorward flow in the extratropical tropopause region, which differs from the mean poleward flow induced by the convergence of large-scale E-P fluxes. The diffusion coefficients estimated from the eddy potential vorticity flux in tropopause-based coordinates reveal that isentropic motions diffuse air between 20 K below and 10 K above the tropopause from late autumn to early spring, while vertical mixing is strongly suppressed at around 10–15 K above the tropopause throughout the year. The isentropic mixing is mainly caused by planetary- and synoptic-scale motions, while small-scale motions with a horizontal scale of less than a few thousand kilometers largely affect the three-dimensional mixing just above the tropopause. Analysis of the gravity wave energy and atmospheric instability implies that the small-scale dynamics associated with the dissipation and saturation of gravity waves is a significant cause of the three-dimensional mixing just above the tropopause. A rapid increase in the static stability in the tropopause inversion layer is considered to play an important role in controlling the gravity wave activity around the tropopause.

scholarly journals The surface layer observed by a high-resolution sodar at DOME C, Antarctica

2014 ◽  
Vol 56 (5) ◽  
Author(s):  
Stefania Argentini ◽  
Igor Petenko ◽  
Angelo Viola ◽  
Giangiuseppe Mastrantonio ◽  
Ilaria Pietroni ◽  
...  
Keyword(s):  
Surface Layer ◽  
Gravity Waves ◽  
High Frequency ◽  
Vertical Resolution ◽  
High Vertical Resolution ◽  
One Year ◽  
Atmospheric Gravity ◽  
Radiation Measurements ◽  
High Range

<p>One year field experiment has started on December 2011 at the French - Italian station of Concordia at Dome C, East Antarctic Plateau. The objective of the experiment is the study of the surface layer turbulent processes under stable/very stable stratifications, and the mechanisms leading to the formation of the warming events. A sodar was improved to achieve the vertical/time resolution needed to study these processes. The system, named Surface Layer sodar (SL-sodar), may operate both in high vertical resolution (low range) and low vertical resolution (high range) modes. <em>In situ</em> turbulence and radiation measurements were also provided in the framework of this experiment. A few preliminary results, concerning the standard summer diurnal cycle, a summer warming event, and unusually high frequency boundary layer atmospheric gravity waves are presented.</p>

scholarly journals First results of the PML monitor of atmospheric turbulence profile with high vertical resolution

2013 ◽  
Vol 559 ◽  
pp. L6 ◽  
Author(s):  
A. Ziad ◽  
F. Blary ◽  
J. Borgnino ◽  
Y. Fanteï-Caujolle ◽  
E. Aristidi ◽  
...  
Keyword(s):  
Atmospheric Turbulence ◽  
Vertical Resolution ◽  
First Results ◽  
High Vertical Resolution

Monitoring atmospheric turbulence profiles with high vertical resolution using PML/PBL instrument

2014 ◽  
Author(s):  
F. Blary ◽  
A. Ziad ◽  
J. Borgnino ◽  
Y. Fantéï-Caujolle ◽  
Eric Aristidi ◽  
...  
Keyword(s):  
Atmospheric Turbulence ◽  
Vertical Resolution ◽  
High Vertical Resolution

A Global Survey of Static Stability in the Stratosphere and Upper Troposphere

2010 ◽  
Vol 23 (9) ◽  
pp. 2275-2292 ◽  
Author(s):  
Kevin M. Grise ◽  
David W. J. Thompson ◽  
Thomas Birner
Keyword(s):  
Inversion Layer ◽  
Broad Band ◽  
Static Stability ◽  
Stability Field ◽  
Vertical Resolution ◽  
Quasi Biennial Oscillation ◽  
Upper Troposphere ◽  
Global Survey ◽  
High Vertical Resolution

Abstract Static stability is a fundamental dynamical quantity that measures the vertical temperature stratification of the atmosphere. However, the magnitude and structure of finescale features in this field are difficult to discern in temperature data with low vertical resolution. In this study, the authors apply more than six years of high vertical resolution global positioning system radio occultation temperature profiles to document the long-term mean structure and variability of the global static stability field in the stratosphere and upper troposphere. The most pronounced feature in the long-term mean static stability field is the well-known transition from low values in the troposphere to high values in the stratosphere. Superposed on this general structure are a series of finer-scale features: a minimum in static stability in the tropical upper troposphere, a broad band of high static stability in the tropical stratosphere, increases in static stability within the core of the stratospheric polar vortices, and a shallow but pronounced maximum in static stability just above the tropopause at all latitudes [i.e., the “tropopause inversion layer” (TIL)]. The results shown here provide the first global survey of static stability using high vertical resolution data and also uncover two novel aspects of the static stability field. In the tropical lower stratosphere, the results reveal a unique vertically and horizontally varying static stability structure, with maxima located at ∼17 and ∼19 km. The upper feature peaks during the NH cold season and has its largest magnitude between 10° and 15° latitude in both hemispheres; the lower feature exhibits a weaker seasonal cycle and is centered at the equator. The results also demonstrate that the strength of the TIL is closely tied to stratospheric dynamic variability. The magnitude of the TIL is enhanced following sudden stratospheric warmings in the polar regions and the easterly phase of the quasi-biennial oscillation in the tropics.

scholarly journals Evaluation of Regional Aircraft Observations Using TAMDAR

2010 ◽  
Vol 25 (2) ◽  
pp. 627-645 ◽  
Author(s):  
William R. Moninger ◽  
Stanley G. Benjamin ◽  
Brian D. Jamison ◽  
Thomas W. Schlatter ◽  
Tracy Lorraine Smith ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Data Assimilation ◽  
Meteorological Data ◽  
Time Range ◽  
Observation System ◽  
Vertical Resolution ◽  
Commercial Aircraft ◽  
Aircraft Observation ◽  
Aircraft Observations ◽  
High Vertical Resolution

Abstract A multiyear evaluation of a regional aircraft observation system [Tropospheric Aircraft Meteorological Data Reports (TAMDAR)] is presented. TAMDAR observation errors are compared with errors in traditional reports from commercial aircraft [aircraft meteorological data reports (AMDAR)], and the impacts of TAMDAR observations on forecasts from the Rapid Update Cycle (RUC) over a 3-yr period are evaluated. Because of the high vertical resolution of TAMDAR observations near the surface, a novel verification system has been developed and employed that compares RUC forecasts against raobs every 10 hPa; this revealed TAMDAR-related positive impacts on RUC forecasts—particularly for relative humidity forecasts—that were not evident when only raob mandatory levels were considered. In addition, multiple retrospective experiments were performed over two 10-day periods, one in winter and one in summer; these allowed for the assessment of the impacts of various data assimilation strategies and varying data resolutions. TAMDAR’s impacts on 3-h RUC forecasts of temperature, relative humidity, and wind are found to be positive and, for temperature and relative humidity, substantial in the region, altitude, and time range over which TAMDAR-equipped aircraft operated during the studied period of analysis.

Sign in / Sign up

Export Citation Format

Share Document